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Inclined loading conditions cannot be avoided and strongly influence the mechanical response of honeycomb structures. In present study, deformation modes as well as dynamic responses of hexagonal honeycomb structures undergoing non-ideal oblique impact loadings have been investigated considering as significant parameters of the load angle (ranging from 0 to 10°) and the impact velocity (ranging from 3 to 70 m/s). Some new deformation phenomena and response modes have been observed. Evident influence of asynchronous loading as well as impact speed on the deformation mode evolution has been determined. Corresponding mode classification maps were constructed. The present study provides a significant advancement to the comprehensive understanding of the dynamic response of honeycombs, which could be used to develop more valuable guidelines for design purposes in cellular energy absorbing devices. [ABSTRACT FROM AUTHOR]

Honeycomb structure is extraordinarily effective to trap light, and the efficiency of solar cell with this texture is as high as 24.4 %. In this paper, plasma immersion ion implantation and acid etching are applied to texture multi-crystalline silicon. Surface reflectivity and surface morphology are investigated by UV-Vis-NIR spectrophotometer and field emission scanning electron microscopy, respectively. We found that random nano-honeycomb structures have been formed on silicon surface. The weighted average reflectance is 7.68 % from 300 to 1,100 nm wavelength region. We obtained honeycomb-textured solar cells following standard fabrication protocol. These solar cells show obvious better performance in short circuit current density (>5.4 %) and efficiency (~0.8 % absolute) compared with acid-textured cell, while other performance parameters, such as open circuit voltage and fill factor, are not deteriorated. [ABSTRACT FROM AUTHOR]

Abstract: Crashworthiness parameters of aluminum hexagonal honeycomb structures under impact loads are investigated by using finite element methods and conducting experiments. To validate the finite element models, numerical results are compared with experimental measurements and theoretical results reported in literature. In numerical simulations of honeycomb structures, out-of-plane loads are considered while the aluminum foil thickness, cell side size, cell expanding angle, impact velocity and mass are varying, and dynamic behavior and crashworthiness parameters are examined. It is observed that there are good agreements between numerical, experimental and theoretical results. Numerical simulations predict that crashworthiness parameters depend on cell specification and foil thickness of the honeycomb structure and are independent of impact mass and velocity. [Copyright &y& Elsevier]